The Naming Of Avalon

"The same expedition which made the Discovery of Ythri had chanced upon Avalon. Though rich prey for colonists, at the time it lay too far from Sol and remained nameless. The season came at last for taking real knowledge of it."
-Poul Anderson, Introduction to "The Problem of Pain" IN Anderson, The Van Rijn Method (Riverdale, NY, 2009), pp. 103-105 AT p. 105.

Ythrians, with some human employees, explore the as yet unnamed planet which is in a system about eighty light years from their sun, Quetlan:

"'The original Survey crew had discovered a terrestroid planet there. They didn't bother to name it. Prospective colonists would choose their own name anyway. Those could be human or Ythrian, conceivably both - if the environment proved out.
"'Offhand, the world - our group called it, unofficially, Gray, after that old captain - the world looked brilliantly promising.'"
-Poul Anderson, "The Problem of Pain" IN The Van Rijn Method, pp. 107-134 AT p. 115.

Philippe Rochefort, Terran prisoner of war, asks:

"'What incurable romantic named this planet?'"
-Poul Anderson, The People Of The Wind IN Anderson, Rise Of The Terran Empire (Riverdale, NY, 2011), pp. 437-662 AT p. 570.

Tabitha Falkayn, brought up by Ythrians, replies:

"'David Falkayn's granddaughter, when he'd decided this was the place to go...'"
-ibid.

We know of David Falkayn's daughter, Juanita, and his son, Nicholas, and of Nicholas' son, Nat. Tabitha informs us that David also had at least one granddaughter but we are told neither her name nor her parentage. David Falkayn has come a long way from a teenage apprentice on Ivanhoe to the legendary Founder of Avalon. This is future biography within future history.

There are three stages in the naming of the planet:

first, it has been discovered but not yet named;
secondly, an exploratory group unofficially calls it Gray;
thirdly, Falkayn's granddaughter names it "Avalon" and "Gray" becomes the name of the more populous of its two cities.